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AssigneeAir Products and Chemicals, Inc.
InventorsAmir Famili, Finn L. Marten, James F. Nangeroni
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An extrudable polyvinyl alcohol composition useful for packaging and molding applications is prepared by melt blending polyvinyl alcohol and thermoplastic polyethylene oxide to provide a product which has improved pH stability and salt solution solubility. Useful extruded articles prepared from such compositions include films and containers. A method for extruding the polyvinyl alcohol composition comprises: adding sufficient energy to the polyvinyl alcohol composition to both melt it and essentially eliminate the polyvinyl alcohol crystallinity in the melt, and simultaneously removing energy from the melt at a rate sufficient to avoid decomposition of the polyvinyl alcohol. The thermoplastic polyethylene oxide may be added to the polyvinyl alcohol before the polyvinyl alcohol is melted and its crystallinity eliminated or blended with the thus thermally treated polyvinyl alcohol and then melt extruding the polyvinyl alcohol/polyethylene oxide blend.
In a melt extrudable composition consisting essentially of melt extrudable polyvinyl alcohol and 1-30 wt % plasticizer, based on polyvinyl alcohol, which has been made melt extrudable by adding sufficient energy to the polyvinyl alcohol to both melt it and substantially eliminate the crystallinity in the melt while simultaneously removing energy from the melt at a rate sufficient to avoid decomposition of the polyvinyl alcohol, the improvement which comprises 5-95 wt % thermoplastic polyethylene oxide, based on polyvinyl alcohol, the polyethylene oxide having an average molecular weight from 100,000 to 2,000,000.
In a melt extrudable composition consisting essentially of melt extrudable 75 to 99+ mole % hydrolyzed polyvinyl alcohol and 3-20 wt % plasticizer, based on polyvinyl alcohol, which has been made melt extrudable by adding about 0.3 to 0.6 KW hr/kg to the polyvinyl alcohol to both melt it and substantially eliminate the crystallinity in the melt while simultaneously removing energy from the melt at a rate sufficient to avoid decomposition of the polyvinyl alcohol, the improvement which comprises 5-70 wt % thermoplastic polyethylene oxide which has an average molecular weight from 100,000 to 500,000.
In a melt extrudable composition consisting essentially of melt extrudable 85 to 98+mole % hydrolyzed polyvinyl alcohol and 5-15 wt % plasticizer, based on polyvinyl alcohol, which has been made melt extrudable by adding about 0.35 to 0.45 KW hr/kg to the polyvinyl alcohol to both melt it and substantially eliminate the crystallinity in the melt while simultaneously removing energy from the melt at a rate sufficient to avoid decomposition of the polyvinyl alcohol, the improvement which comprises 25-60 wt % thermoplastic polyethylene oxide which has an average molecular weight from 100,000 to 500,000.
In a method for making a melt extruded polyvinyl alcohol article which comprises
In a method for making a melt extruded polyvinyl alcohol article which comprises
Dependencies are inferred from the claim text.